Walhello is a medium sized spider based search engine developed in the Netherlands with basic functionalities. The Walhello spider is called "appie". The Walhello search engine debuted in the summer of 2000 with a small index. Since then the index has grown to almost 1 billion indexed web pages. Like most spider based search engines the ranking of search results is based on mathematical algorithms. Walhello is doing research on the use of Knowledge Technology to improve the relevancy of search results.
The Walhello search engine is running on a cluster of Linux servers and is programmed in C.
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